If you planning to travel to San Juan Island National Historic Park, Friday Harbor, Washington, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 4:01 PM. The temperature feels like 49.45 with a humidity level of 82 so dress accordingly. Cloud coverage is 84 percent with visibility at 10.3 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling southeast at a speed of 16 MPH. At the end of the day don’t miss the sunset at 12:20 AM.